KR20150035338A - signal processing apparatus and signal processing method thereof - Google Patents

Abstract

Disclosed is a signal processing apparatus. The signal processing apparatus comprises: a packet classification unit for receiving a transmission stream including content and classifying a plurality of packets forming the content based on the predetermined reference into a plurality of packet groups; and a transmission unit for transmitting each of a plurality of packet groups into each of a plurality of signal processing paths to which different signal processing is applied.

Description

[0001] DESCRIPTION [0002] SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD THEREOF [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing apparatus and a signal processing method thereof, and more particularly, to a signal processing apparatus for receiving and processing a transmission stream and a signal processing method thereof.

In the information society of the 21st century, broadcasting and communication services are in the era of full-scale digitalization, multi-channelization, broadband and high-quality. In particular, with the spread of high-definition digital TVs, PMPs, and mobile broadcasting devices, demand for supporting various receiving methods of digital broadcasting services is increasing.

In accordance with this demand, DVB-T2 (Digital Video Broadcasting-Terrestrial version 2) is a terrestrial digital broadcasting standard established by improving the performance of DVB-T in the DVB group.

In particular, DVB-T2 introduces the concept of PLP (Physical Layer Pipe), which is a kind of logical channel in the physical layer. Since each PLP has a different modulation scheme, a channel coding rate, a time and a cell interleaving length, it is possible to provide various broadcasting services using the modulation scheme, the channel coding rate, the time and the cell interleaving length.

However, objects processed through PLP in DVB-T2 are classified by service unit. Accordingly, when various video data and audio data are provided through one service and the QoS (Quality of Service) required for them is different, they are processed in the same PLP. In other words, we processed all of these data in the PLP to ensure that there is no loss of data that requires the highest QoS.

As described above, in the conventional DVB-T2, there is a problem that the QoS required for each of various data constituting one service is not taken into consideration, which is inefficient in terms of data processing and transmission.

SUMMARY OF THE INVENTION The present invention provides a signal processing apparatus and a signal processing method therefor that enable various data provided through a single service to be processed through different PLPs according to types of data, have.

According to an aspect of the present invention, there is provided a signal processing apparatus for receiving a transport stream including content and classifying a plurality of packets constituting the content into a plurality of packet groups according to a predetermined criterion And a transmitter for transmitting each of the plurality of packet groups to each of a plurality of signal processing paths to which different signal processing is applied.

Here, each of the plurality of signal processing paths may perform encoding for each packet group received using a different coding rate.

The packet classifier may classify the plurality of packets into a plurality of packet groups according to a type of data constituting the packet.

The packet classifier may determine a type of data constituting the packet using a PID (Packet Identifier) included in each of the plurality of packets.

In addition, the transmitting unit may transmit at least one packet and a null packet belonging to each packet group.

The plurality of signal processing paths may be a PLP (Physical Layer Pipe) defined in the Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2) standard.

According to another aspect of the present invention, there is provided a signal processing method including: receiving a transport stream including content; classifying a plurality of packets constituting the content according to a predetermined criterion into a plurality of packet groups; To each of the plurality of signal processing paths to which different signal processing is applied.

Here, each of the plurality of signal processing paths may perform encoding for each packet group received using a different coding rate.

The classifying step may classify the plurality of packets into a plurality of packet groups according to a type of data constituting the packet.

The classifying step may determine a type of data constituting the packet using a PID (Packet Identifier) included in each of the plurality of packets.

In addition, the transmitting step may feed and transmit at least one packet and a null packet belonging to each packet group.

The plurality of signal processing paths may be a PLP (Physical Layer Pipe) defined in the Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2) standard.

According to various embodiments of the present invention as described above, various data existing in one service may be processed and transmitted according to different types of data. Thus, the data processing and transmission efficiency can be improved.

1 is a block diagram illustrating a configuration of a signal processing apparatus according to an embodiment of the present invention;
2 is a block diagram illustrating the operation of a signal processing apparatus according to an exemplary embodiment of the present invention,
3 is a block diagram illustrating a configuration of a DVB-T2 system according to an embodiment of the present invention, and FIG.
4 is a flowchart illustrating a signal processing method according to an embodiment of the present invention. And transmitted. Thus, the data processing and transmission efficiency can be improved.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram illustrating a configuration of a signal processing apparatus according to an embodiment of the present invention. Referring to FIG. 1, the signal processing apparatus 100 includes a packet classifying unit 110 and a transmitting unit 120.

The packet classifying unit 110 receives the transport stream including the content. Here, the content may be a program composed of at least one video data and audio data. The video data and the audio data can constitute a stream in the form of a packet.

Meanwhile, the transport stream may be an SP (Single Program) transport stream composed of one program, or an MP (Multi Program) transport stream generated by multiplexing an SP transport stream. Thus, in the case of an MP transport stream, it can be composed of a plurality of programs.

The transport stream may include information defining a relation between the program and at least one video data and audio data constituting the program, for example, PSI (Program Specification Information).

The packet classifying unit 110 classifies a plurality of packets constituting the content into a plurality of packet groups according to a predetermined criterion.

Specifically, the packet classifying unit 110 can classify a plurality of packets into a plurality of packet groups according to the type of data constituting the packet. In this case, the packet classifying unit 110 can determine the type of data constituting the packet using a PID (Packet Identifier) included in each of the plurality of packets.

For example, the packet classifying unit 110 may classify a packet including data belonging to a base layer and a packet including data belonging to an enhanced layer into different packet groups. Here, the data belonging to the base layer and the data belonging to the enhanced layer may be image data generated by encoding using the SVC (Scalable Video Coding) method.

As another example, the packet classifying unit 110 may classify a packet including a left eye image and a packet including a right eye image into different packet groups. Here, the left eye image and the right eye image may be image data generated so as to have a predetermined time difference to provide a 3D image to the user.

Meanwhile, in the above example, the packet classifying unit 110 determines the type of data constituting a packet by using the PID. However, this is merely an example, and it goes without saying that various methods can be used. For example, the packet classifying unit 110 may determine the type of data constituting a packet by using information included in a separate extension field provided in the packet.

The transmitting unit 120 may transmit each of the plurality of packet groups to each of the plurality of signal processing paths to which different signal processing is applied. Here, each of the plurality of signal processing paths can perform encoding for each packet group received using a different coding rate.

In this case, the transmitting unit 120 may transmit at least one packet and null packet belonging to each packet group. That is, in order to form a signal processing unit that can be processed in the signal processing path, the transmitter 120 inserts a null packet into each of a plurality of packet groups, and generates a transport stream so as to have the same bit rate as before classification into a plurality of packet groups And transmit each of the transport streams generated by inserting null packets into each of the signal processing paths.

The plurality of signal processing paths may be a PLP (Physical Layer Pipe) defined in Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2), which is one of the European digital broadcasting standards. Here, the PLP refers to a path through which a service is transmitted or a stream transmitted through the path. In the DVB-T2 standard, different modulation schemes, coding schemes, coding rates, interleaving units, and the like may be applied for different PLPs.

For example, it is assumed that the signal processing apparatus 100 receives a transport stream from a broadcast service provider such as a broadcast station, and transmits the transport stream to a digital broadcast transmitter (not shown) according to the DVB-T2 standard. In this case, in order to process a packet having different types of data through respective PLPs in a digital broadcast transmitter (not shown), the signal processing apparatus 100 transmits a transport stream received from a broadcast service provider, It is possible to classify a plurality of packet groups into a plurality of packet groups, and to transmit each of the transport streams generated based on each packet group to each PLP provided in a digital broadcast transmitter (not shown).

In the above example, the digital broadcast transmitter (not shown) may be the digital broadcast transmitter 300 shown in FIG. 3A.

Also, the plurality of signal processing paths may be a signal processing path corresponding to the PLP prepared in the next generation broadcasting standard such as ATSC (Advanced Television Systems Committee) 3.0.

Accordingly, the signal processing apparatus 100 can cause not only the program unit constituting the transport stream, that is, one broadcast service unit but the video data or audio data constituting the program to be processed in different PLPs according to the data type .

For example, it is assumed that the transport stream is composed of a packet including data belonging to the base layer and a packet including data belonging to the enhanced layer.

In this case, the packet classifying unit 110 may classify a plurality of packets constituting the transport stream into a first packet group including data belonging to the base layer and a second packet group including data belonging to the enhanced layer .

The transmitting unit 120 transmits a transport stream generated by adding a null packet to the first packet group to the first PLP, adds a null packet to the second packet group, and transmits the transport stream to the second PLP . Here, the first PLP may be a signal processing path that performs encoding to be error-robust over the second PLP by an encoding type, a coding rate or the like.

As described above, the reason why the packet group composed of the video data belonging to the base layer is transmitted to the PLP that performs encoding so as to be relatively robust against errors is as follows.

The data belonging to the base layer can provide services to the user by itself without referring to other data, while the data belonging to the enhanced layer can provide services to the user by referring to other data, . In this case, data belonging to the base layer can be SD image data capable of providing SD image quality, and data belonging to the enhanced layer can be HD image data capable of providing HD image quality.

On the other hand, in the case of performing encoding to be relatively robust against errors, the possibility of receiving and recovering the transport stream at the receiving side is increased when an error occurs due to the channel. Therefore, by transmitting the data belonging to the base layer that can provide the service to the user to the PLP that performs encoding so as to be robust against errors, it is possible to transmit data belonging to the base layer So that the service can be provided to the user.

As another example, it is assumed that the transport stream is composed of a packet including left eye image data and a packet including right eye image data.

In this case, the packet classifying unit 110 may classify a plurality of packets constituting the transport stream into a first packet group including left eye image data and a second packet group including right eye image data.

The transmitting unit 120 transmits a transport stream generated by adding a null packet to the first packet group to the first PLP, adds a null packet to the second packet group, and transmits the transport stream to the second PLP . The transmitting unit 120 transmits the transport stream generated by adding the null packet to the first packet group to the second PLP, adds the null packet to the second packet group, and transmits the generated transport stream to the first PLP It is possible.

Again, the first PLP may be a signal processing path that performs encoding to be more error robust than the second PLP, such as by a coding rate or encoding type.

As described above, in the case of the 3D image, if the receiving side can receive and reconstruct one of the left eye image data and the right eye image data, the 2D image can be provided to the user even if it is not a 3D image.

That is, when both the left eye image data and the right eye image data are processed and transmitted through one PLP, the image data may not be restored at the receiving end when an error occurs due to the channel. However, in the case of processing the left eye image data and the right eye image data through different PLPs and transmitting them, even if an error due to the channel occurs, the receiving side can relatively easily process the error between the left eye image data and the right eye image data through the PLP The possibility of receiving and restoring the processed image data is increased, so that a 2D image can be provided to a user even if it is not a 3D image.

In the above example, the signal processing apparatus 100 receives the transport stream and processes the transport stream. However, the signal processing apparatus 100 may be an Internet protocol (IP) stream, A GSE (General Stream Encapsulation) stream, and the like, and classifies packets in the stream into a plurality of packet groups according to a data type, and transmits the stream generated based on each packet group to the PLP.

2 is a diagram for explaining the operation of the signal processing apparatus according to an embodiment of the present invention.

2 (a) is a block diagram for explaining a detailed configuration of a signal processing apparatus according to an embodiment of the present invention.

2 (a), the signal processing apparatus 100 includes a data type determination unit 111, a diffracting unit 113, a null packet generating unit 121, and a fading unit 123. The data type determiner 111 and the demultiplexer 113 constitute the packet classifying unit 110 of FIG. 1 and the null packet generating unit 121 and the padding unit 123 correspond to the transmitting unit 120).

The data type determination unit 111 determines the type of data included in each of the plurality of packets constituting the transport stream. In this case, the data type determination unit 111 can determine the type of data included in each packet using the PID of each packet.

The data type determination unit 111 may generate a control signal and transmit the control signal to the denormalization unit 113 and the null packet generation unit 121. Accordingly, the demultiplexer 113 demultiplexes the plurality of packets into a plurality of packet groups based on the type of data determined by the data type determination unit 111, and the null packet generation unit 121 generates the bit rate It is possible to generate a null packet to be muxed into each packet group to maintain.

The demultiplexer 113 demultiplexes a plurality of packets constituting the transport stream into a plurality of packet groups based on the control signal received from the data type determination unit 111 and outputs each packet group to the padding unit 123 can do. In this case, the denuding unit 113 can demultiplex a plurality of packets into a plurality of packet groups based on the data type. At this time, one packet is not necessarily allocated to only one packet group, but can be simultaneously allocated to a plurality of packet groups. For example, packets including information on services such as PSI (Program-specific information) defined in the MPEG2 TS and Program and System Information Protocol (PSIP) defined in the ATSC can be simultaneously allocated to a plurality of packet groups .

For example, the demultiplexer 113 can demultiplex a plurality of packets constituting a transport stream into a packet group including data belonging to the base layer and a packet group including data belonging to the enhanced layer. Here, a packet group including data belonging to the base layer must include packets containing information on the corresponding service in order to provide an independent service using only packets belonging to the packet group.

As another example, the demultiplexer 113 may demultiplex a plurality of packets constituting the transport stream into a packet group including a left eye image and a packet group including a right eye image.

As another example, when the two or more services are multiplexed in the transport stream, the demultiplexer 113 classifies a plurality of packets constituting the transport stream into media packets and demultiplexes the packets into a plurality of packet groups, It is possible to simultaneously allocate packets including information on each service to a plurality of packet groups.

The null packet generation unit 121 generates a null packet to be inserted into each packet group, and transmits the generated null packet to the mux 123. At this time, the null packet generating unit 121 can generate as many null packets as the number to be mapped to each packet group, in order to form a signal processing unit processable in the signal processing path.

The muxing unit 123 muxes null packets into each packet group and transmits each transport stream (TSPS) 1, TSPS2, ..., TSPSn generated by nulling the null packet to each of the signal processing paths PLP1, PLP2, ..., PLPn.

2 (b) is a view for explaining a transport stream outputted from a signal processing apparatus according to an embodiment of the present invention.

For example, as shown in FIG. 2B, a transport stream 210 composed of six packets, that is, packets # 1 to # 6 (TSP # 1, ..., TSP # 6) As shown in FIG.

In this case, the signal processing apparatus 100 classifies a plurality of packets constituting a transport stream into a plurality of packet groups according to the type of data contained in the packets, and transmits at least one packet and a null packet included in each packet group To generate a transport stream, and output each transport stream to each of the different signal processing paths.

For example, among the packets # 1 to # 6 constituting the transport stream 210, the packet # 1, the packet # 3, and the packet # 6 are packets containing data belonging to the base layer, It is assumed that the packet # 5 is a packet including data belonging to the enhancer.

In this case, the signal processing apparatus 100 transmits the packet # 1 to the packet # 6 to the first packet group composed of the packet # 1, the packet # 3, and the packet # 6, 2 packet group.

Then, the signal processing apparatus 100 inserts a null packet at the position where the packet # 2, the packet # 4, and the packet # 5 are removed in the case of the first packet group composed of the packet # 1, the packet # 3, In the case of the second packet group composed of Packet # 2, Packet # 4 and Packet # 5, a null packet can be inserted at a position where Packet # 1, Packet # 3, and Packet # 6 are removed. In this manner, the insertion of a null packet is intended to have the same bit rate as the original transport stream.

Then, the signal processing apparatus 100 can transmit the first transport stream 221 composed of the first packet group and the second transport stream 223 composed of the second packet group to different PLPs.

Meanwhile, the signal processing apparatus 100 described above can process a transport stream received from the outside and transmit it to a digital broadcast transmitter conforming to the DVB-T2 standard. The digital broadcast transmitter according to the DVB-T2 standard processes the transport stream, To a digital broadcasting receiver according to the standard. Hereinafter, the DVB-T2 system will be described. However, since the DVB-T2 system is already known, a detailed description thereof will be omitted.

3 is a block diagram for explaining a configuration of a DVB-T2 system. Particularly, FIG. 3A is a block diagram for explaining a digital broadcasting transmitter 300 according to the DVB-T2 standard, FIG. 3B is a block diagram for explaining a digital broadcasting receiver 400 according to the DVB- Block diagram.

3 (a), the digital broadcast transmitter 300 may include an input processor 310, a BICM encoder 320, a frame builder 330, and a modulator 340. The configuration of the digital broadcasting transmitter 300 is the same as that defined in DVB-T2, which is one of the European digital broadcasting standards.

The input processor 310 receives a stream including service data through a plurality of PLPs and generates a BBFRAME (Baseband Frame). Here, the input stream may be a transport stream, a GSE stream, an IP stream, or the like.

In particular, the stream input to the input processor 310 may be a stream generated by the signal processing apparatus 100. That is, as described above, the signal processing apparatus 100 receives a stream from a broadcast service provider, classifies a plurality of packets constituting a stream into a plurality of packet groups according to a data type, To the input processors 310-1, 310-2, ..., 310-n.

Herein, the data PLP includes a PSI / PSI such as video data, audio data, a Program Association Table (PAT), a Program Map Table (PMT), a Network Information Table (NIT), a Service Description Table (SDT) SI information. Accordingly, each transport stream generated in the signal processing apparatus 100, that is, a transport stream including the same type of data, can be transmitted to the input processor 310 through the data PLP and processed.

Here, the NIT indicating the network information among the PSI / SI information can be implemented in Syntax as follows. The following descriptor is based on the DVB-SI representation scheme, and the descriptor_length field indicates the total number of bytes required to represent the descriptor after the byte representing the field.

As described above, in the case where a plurality of packets constituting one transport stream are processed in different PLPs according to the data type, the NIT is the number of PLPs (number_plp) used for processing one transport stream and the ID plp_id).

In another embodiment of the NIT, after setting an identifier designating a group PLP, which is a set of PLPs, an identifier is included in the NIT, and the identifier of the group PLP, the number of PLPs constituting the group PLP, Lt; / RTI > At this time, among the PSI / SI information, the NIT representing the network information can be implemented in syntax as follows.

On the other hand, a plurality of PLPs may include the same PSI / SI information. In this case, a plurality of PLPs may be set as one PLP group and the same information may be transmitted to one common PLP associated with the PLP group.

Consider a case where packets including PSI / SI information are contained in only one PLP in the group PLP. Generally, PSI / SI information is transmitted repeatedly at specific time intervals. Therefore, in order to find the PLP including the PSI / SI information, all the PLPs belonging to the group PLP should be restored by collecting all the packets by the PSI / SI repetition period. This can cause a long delay in the initialization process of the system or in the service acquisition process when the service information is changed. Especially, in case of mobile broadcasting, re - acquisition of service through fast channel search is essential when the service area is changed. Therefore, in the present invention, when only one PLP in the group PLP includes packets including PSI / SI information, the PLP group identifier of the PLP group is an identifier of a PLP including a packet including PSI / SI information Set it to be the same as plp_id. In this case, the receiver can quickly obtain PSI / SI information by preferentially processing the PLP having the same plp_id as plp_group_id in the service acquisition process.

On the other hand, when all the PLPs in the group PLP include packets including PSI / SI information, a number independent from each other in the plp_id and the plp_group_id can be freely allocated.

 The Bit Interleaver Coding & Modulation (BICM) encoder 320 determines a FEC coding rate and a constellation order according to a region (Fixed PHY Frame or Mobile PHY Frame) to which data to be transmitted is to be transmitted. Also, the BICM encoder 320 performs coding on the signaling information on the data to be served.

The frame builder 330 and the modulator 340 form an OFDM parameter for the signaling region and an OFDM parameter for the region to which the data to be transmitted is to be transmitted to form a frame and add a sync region to generate a frame. Then, modulation is performed to modulate the generated frame with the RF signal, and the RF signal is transmitted to the receiver.

In this case, information for recognizing whether the received frame is a Mobile frame or a Fixed frame is inserted in the sink area. If the OFDM parameters of the signaling region or the data region for each frame are not predetermined, the information for recognizing the signaling region or the data region, that is, the OFDM parameters for the signaling region and the data region, is stored in the sink area and transmitted.

3B, the digital broadcast receiver 400 may include a demodulator 410, a frame de-builder 420, a BICM decoder 430, and an input de-processor 440.

The demodulator 410 demodulates the received RF signal according to the OFDM parameter to perform sync detection. When the sync is detected, the demodulator 410 recognizes whether the mobile frame is received or the fixed frame is received from the information stored in the sink area.

In this case, if the OFDM parameters for the signaling area and the data area are not predetermined, the OFDM parameters for the signaling area and the data area stored in the sink area are obtained and the signaling area and the data area OFDM parameter information and perform demodulation.

The frame de-builder 420 inputs the demodulated data for the signaling region to the BICM decoder 430 for the signaling region.

The BICM decoder 430 decodes the input data. In this case, the BICM decoder 430 can obtain parameters such as the FEC scheme and the modulation scheme for data stored in each data area using the signaling information, and perform decoding.

The input de-processor 440 may process the BBFRAME received from the BICM decoder 430 to generate data to be served.

Meanwhile, the data acquisition process shown in FIG. 3 (b) assumes that one service is transmitted in a single PLP. When one service is transmitted to a plurality of PLPs, a plurality of PLPs can be time-divided and decoded using one BICM decoder 430 and a separate control device according to an embodiment. In another embodiment, a plurality of PLPs can be simultaneously decoded using a plurality of BICM decoders.

4 is a flowchart illustrating a signal processing method according to an embodiment of the present invention.

First, a transport stream including content is received, and a plurality of packets constituting the content are classified into a plurality of packet groups according to a predetermined criterion (S410).

Specifically, the plurality of packets can be classified into a plurality of packet groups according to the type of data constituting the packet. In this case, the type of data constituting the packet can be determined using a PID (Packet Identifier) included in each of the plurality of packets.

Then, each of the plurality of packet groups is transmitted to each of the plurality of signal processing paths to which different signal processing is applied (S420). In this case, at least one packet belonging to each packet group and a null packet can be muxed and transmitted.

On the other hand, each of the plurality of signal processing paths can perform encoding for each packet group received using a different coding rate. For example, the plurality of signal processing paths may be a PLP (Physical Layer Pipe) defined in the Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2) standard.

Meanwhile, a non-transitory computer readable medium may be provided in which a program for sequentially performing the signal processing method according to the present invention is stored.

A non-transitory readable medium is a medium that stores data for a short period of time, such as a register, cache, memory, etc., but semi-permanently stores data and is readable by the apparatus. In particular, the various applications or programs described above may be stored on non-volatile readable media such as CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM,

In the above-described block diagram of the signal processing apparatus, although a bus is not shown, the communication between the respective components in the electronic apparatus may be performed through a bus. Further, each device may further include a processor such as a CPU, a microprocessor, or the like that performs the various steps described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

100: signal processing apparatus 110: packet classifying unit
120:

Claims (12)

A packet classifier for receiving a transport stream including content and classifying a plurality of packets constituting the content into a plurality of packet groups according to a predetermined criterion; And
And a transmitting unit for transmitting each of the plurality of packet groups to each of a plurality of signal processing paths to which different signal processing is applied. The method according to claim 1,
Wherein each of the plurality of signal processing paths includes:
And performs encoding for each packet group received using a different coding rate. The method according to claim 1,
Wherein the packet classifier comprises:
And classifies the plurality of packets into a plurality of packet groups according to a type of data constituting the packet. The method of claim 3,
Wherein the packet classifier comprises:
Wherein a type of data constituting the packet is determined using a PID (Packet Identifier) included in each of the plurality of packets. The method according to claim 1,
Wherein the transmission unit comprises:
Wherein at least one packet belonging to each packet group and a null packet are muxed and transmitted. The method according to claim 1,
Wherein the plurality of signal processing paths include:
Is a PLP (Physical Layer Pipe) defined in the Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2) standard. A signal processing method of a signal processing apparatus,
Receiving a transport stream including content and classifying a plurality of packets constituting the content into a plurality of packet groups according to a predetermined criterion; And
And transmitting each of the plurality of packet groups to each of a plurality of signal processing paths to which different signal processing is applied. 8. The method of claim 7,
Wherein each of the plurality of signal processing paths includes:
Wherein encoding is performed for each packet group received using a different coding rate. 8. The method of claim 7,
Wherein said classifying comprises:
And classifying the plurality of packets into a plurality of packet groups according to a type of data constituting the packet. 10. The method of claim 9,
Wherein said classifying comprises:
Wherein a type of data constituting the packet is determined using a PID (Packet Identifier) included in each of the plurality of packets. 8. The method of claim 7,
Wherein the transmitting comprises:
Wherein at least one packet belonging to each packet group and a null packet are muxed and transmitted. 8. The method of claim 7,
Wherein the plurality of signal processing paths include:
(Physical Layer Pipe) defined in the Digital Video Broadcasting-Terrestrial Version 2 (DVB-T2) standard.

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